Thinner persons tend to have a larger capacity. ... fat percentage, and fat free mass as reference variables for lung function: effects on terms for age and sex. Total lung capacity is one marker of lung function that can be helpful in determining how well a treatment plan is working, how your lung condition is progressing, or whether you're a good candidate for lung surgery. Your lung capacity is the total amount of air that your lungs can hold. The lung capacity calculator requires the following: Inspiratory reserve volume – is approximately 3 L and represents the amount of air that can be forcefully inspired after a normal inspiration. Middle-aged reference equations classify subjects as being below the total lung capacity lower limit of normal between 17.9 and 62.5% of the women and between 12.5 and 42.2% of the men of the current study. Females tend to have a 20–25% lower capacity than males. A HUGE percentage, of those suffering with any form of depression, smoke. For example, if the FEV1 is 4 and the FVC is 5, then the FEV1/ FVC ratio would be 4/5 or 80%. Similar to VC, functional residual capacity depends on the residual volume which is estimated through a set of formulas, more often than it is measured directly. 13-2). The vital capacity (VC) is … Over time, our lung capacity and lung function typically decrease slowly as we age after our mid-20s. Tall people tend to have a larger total lung capacity than shorter people. Total Lung Capacity(TLC) 5.8: 4.2: IRV + TV + ERV +RV: Maximum amount of air that is filled by the lungs: Lung volumes measure the amount of air for a specific function, while lung capacities are the sum of two or more volumes. Hi me44_4_, welcome to JA. Lung capacity is not a sufficient variable to base the prognosis of lung disease. It is one of the four respiratory capacities calculated while performing functional lung testing, along inspiratory capacity, functional residual capacity and total lung capacity. The inspiratory capacity (IC) is the amount of air that can be inhaled after the end of a normal expiration. I hate to think we are "just weaker" as some have suggested to me. Whether you have an existing respiratory condition, or have noticed difficulty or changes in your breathing, it is a good idea to take some tests to measure your lung capacity. "Normal" lung capacity varies by age, sex, weight, smoking history, and height and can be improved through pulmonary rehab and exercise. Best wishes! Overview. The total lung capacity depends on the person's age, height, weight, and sex, and normally ranges between 4 and 6 litres. Smokers have a lower capacity than nonsmokers. Could be our brains are wired differently; or maybe we are just more vulnerable. How to Measure Lung Capacity. Static Lung Volumes. So, 60-75% lung function left sounds like heaven to me. During quiet ventilation, the volume of air inspired and expired in one breath is the tidal volume, normally 500 to 750 mL. 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